diff --git a/htdocs/core/class/commondocgenerator.class.php b/htdocs/core/class/commondocgenerator.class.php
index 3cc8c553030..9e5a00bb650 100644
--- a/htdocs/core/class/commondocgenerator.class.php
+++ b/htdocs/core/class/commondocgenerator.class.php
@@ -32,7 +32,7 @@
 abstract class CommonDocGenerator
 {
 	var $error='';
-	public $db;
+	protected $db;
 	
 	
 	/**